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Boiler Service

Discussion in 'Plumbing and Central Heating' started by Doug99, 25 Aug 2011.

  1. heatgas

    heatgas

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    will you explain it or not? it would be most helpful if you COULD.
     
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  3. Heat4input

    Heat4input

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    [quote="heatgas

    Unless you read the O2 and excess air off the analiser printout how can you possibly know the figures. :rolleyes:[/quote]

    Experience? :D
     
  4. gasafengineer

    gasafengineer

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    CO2% is used to calculate O2%. (safe co ppm)
     
  5. mysteryman

    mysteryman

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    Why can't you guys be helpful, or just shut up?

    These figures were read from a flue gas analyser. They are good.

    CO2 and O2 vary inversely with each other, and it is usually the oxygen value which is measured nowadays, although in the past carbon dioxide was measured with wet analysers. That is why both figures are in use.

    Carbon monoxide at 1% in air is indeed fatal, but the analyser is measuring the concentration in the flue gas, not the air in the room, and the figure quoted is OK.
     
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  6. Boilerman2

    Boilerman2

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    Not enough Zeros!!! :rolleyes:
     
  7. bengasman

    bengasman

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    000000000
    00000000
    00000000

    Help yourself mate. Let me know if you need more, I've got plenty.
     
  8. gasafengineer

    gasafengineer

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    I'll try to explain so here goes , will await the bashing. :D

    Some will argue that O2% can't be calcuated from CO2% , reason being how do we know whether CO2% is on the left (fuel rich) or right (fuel lean) side of the stoichiometric combustion bell chart , well we don't , then again if CO2 @ 6.5% were on the fuel/rich side of the curve CO would be in excess of 30000ppm (3%) , in the case here we know CO to be pretty low (64ppm) with a CO/CO2 ratio of 0.0006 , so with this in mind we can safely say combustion is fuel/lean , this being the case O2/Xs air can be sought from CO2% of flue gas.

    Calc...........

    9.4% CO2 X 20.9 = 196.46/11.9 (co2max)= 16.509....20.9-16.509 = 4.3 O2%/26% Xsair.

    Above calc is the reversal of CO2max/CO2

    CO2 = 11.9 (co2max) X (20.9 - 4.3)
    ------------------------------------------------- = 9.4%
    20.9

    ..........& failing this seek FGA readings. :cool: :D
     
  9. monoxide62

    monoxide62

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    And you were helpful? :confused:
     
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  11. Gasman77

    Gasman77

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    :rolleyes:
     
  12. kevindgas

    kevindgas

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    OP, if you haven't already jumped off a cliff!! I would definate recommend a magnet filter be fitted to the return from the central heating and like already posted by someone else,I prefer the Fernox TF1 as well £85 plus Vat is what i'm currently paying for them then i would charge £50 to fit if local
     
  13. gasafengineer

    gasafengineer

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    :mrgreen: ..the OP did ask!!
     
  14. kevindgas

    kevindgas

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    1st mistake!! :LOL:
     
  15. Doug99

    Doug99

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    Thanks all for your input and happy now that the figures confirm my boiler is running efficiently.

    As for the filter, whenever I do any DIY on the radiators the water is always clear so I will defer for now any decision on fitting one.

    One other point - 'inhibitor' was put in the system during boiler installation, but as I have partially drained the system to fit a couple of TRVs, is there a DIY method of measuring the level of inhibitor remaining in the system?

    Cheers - Doug
     
  16. DP

    DP

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    Boiler was not serviced but checked for safe operation. Look at the manual and you will realise what a service entails.
     
  17. Doug99

    Doug99

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    DP - I do appreciate the difference, and am of the opinion that "if it works.....don't fix it". As the boiler has been monitored to be running efficiently, then that will do for me. :D
     
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